It will be an elite skin, meaning it should cost some amount of R6 credits to purchase, though a specific price point was not divulged. The Ash Elite Set will also include a victory animation, multiple weapon skins, and a Lara Croft chibi charm.
You can check out the announcement video below. Note that the dual-wielding seen in the video may only be for Ash's victory animation as an homage to Lara Croft's signature look. Rainbow Six Siege does not support dual-wielding, though it is something that developer Ubisoft Montreal has experimented with.
This appears to be the first crossover skin from another publisher's game. Given the immense popularity of Siege--it has more than 50 million registered accounts--it makes sense that other franchises might look to the game as another means of promotion.
Siege has crossed over with another franchise before, however, as the game launched a tie-in event for the Netflix series Money Heist back in 2019.
In other news, Ubisoft has confirmed that the operator Tachanka is getting major overhaul with an upcoming update. Additionally, Ubisoft has said Siege should be available for PlayStation 5 and Xbox Series X at launch, featuring multiplayer cross-play with PS4 and Xbox One.
The next Rainbow Six game is Rainbow Six: Quarantine, which is a three-player tactical co-op shooter that's in development for PS5, Xbox Series X, and PC, in addition to current-generation consoles.
As for the Tomb Raider franchise, 2018's Shadow of the Tomb Raider is the latest entry and it was the final entry in the new trilogy that began in 2013. In other news, a new music album featuring remakes of several songs from Peter Connelly's soundtracks for numerous Tomb Raider games, is available to stream now across several major music services.